battery or cap?

[cbuts 10+ year member]

Just fuse positive wires
Optima batteries are now shit. Do not buy them. Get an AGM that is made by East Penn (Deka or another name) or Exide (which would be more expensive).

A 140 amp alternator isn't great, but it's not terrible.

An Exide groub 65 AGM would cost $200 at our shop. A 300 amp alternator is in the $500 dollar range depending on which brand you get. Try the battery and big three first before you get an alternator.

Also, make sure to double check your grounds. Depending on how old the install is, there may be corrosion building up at your ground points. Re-sanding may help

Thanks very much for the reply.

0 guage ofc is on the way, I will order a 300A fuse today.

Now my question is, where can I put a second battery in my truck , everything is mounted behind the seats in the back

 

[cbuts 10+ year member]

Would this be good

ANL Fuse Holder 0 2 4 Gauge With 100A 300A Gold Plate | eBay

 

[cbuts 10+ year member]

 

[adulbrich 5,000+ posts]

Anywhere you can get it to fit, honestly. It's hard to say without physically being there and looking around